#!/usr/bin/env python
# coding:utf-8
'''
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黄哥Python培训 黄哥改写
Python 3
P111 页
string.letters 修改为 string.ascii_letters
'''

import string

alphas = string.ascii_letters + '_'
nums = string.digits

print('Welcome to the Identifier Checker v1.0')
print('Testees must be at least 2 chars long.')
myInput = input('Identifier to test? ')

if len(myInput) > 1:

    if myInput[0] not in alphas:
        print('''invalid: first symbol must be alphabetic''')
    else:
        for otherChar in myInput[1:]:
            if otherChar not in alphas + nums:
                print('''invalid: remaining symbols must be alphanumeric''')
                break
        else:
            print("okay as an identifier")
